Question

In one polynucleotide strand of a DNA molecule, the ratio of $A+T/G+C$ is $0.3$. What is the $A+G/T+C$ ratio of the entire DNA molecule?

• A. $0.3$
• B. $0.6$
• C. $1.2$
• D. $1$

Answer 1

The correct option is D $1$

A + T/G + C ratio is species specific and here mentioned to be 0.3.

While A + G/T + C is the ratio which is constant for all double-stranded DNA and its value is 1 because in a ds-DNA Adenine will always bind to Thymine so A=T while Guanine will always bind to Cytosine so G=C and Purine will always be equal to pyrimidines according to Chargaff rule.

So, the correct answer to the question is '1'.